Draftsman&#39;s pen.



J. G. FERGER.

DRAFTSMAN'S PEN.

APPLICATION rum mm. 29, 1011.

Patented Sept. 26, 1911.

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JOHN CHARLES FERGER, OF INDIANAPOLIS, INDIANA.

DRAFTSMANS PEN.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application Medium 29, 1911. Serial No. 636,003.

. opens for drawing straight lines comprising a pair of steel bladeswhich are adjusted with relation to each other to regulate the size ofthe line, and the object of the invention is to provide an ink magazineor reser- 1 v0ir which will not interfere with the separation of theblades for the purpose of cleaning them, and my object is to improveupon the construction of instruments of the above character in variousways which will be hereinafter fully described and pointed out in theappended claims.

I accomplish the objects of my invention by the mechanism illustrated inthe accompanying drawing, in which Figure lis a view in side elevationof a pen provided with my improvements, Fig. '2 is a topview of same,Fig. 3 a view in side elevation of the blades of the pen open forcleaning. Fig. 4 is a view of the reuse-verse side of the pen from thatshown in Fig. 1, with the clasp open. Fig. 5 is a view of the left sideof the pen showing the hinged blade equipped with my improvement, therigid blade being broken away.

,35-Fig. 6 is aview of the rigid blade on the right side of the pen withmy invention ap plied. Fig. 7 is a section on a larger scale on the line7-7 of Fig. 2. Fig. 8 is a section on a larger scale on the line 8-8 ofFig. 9 and Fig. 9 also on a larger scale shows a portion of both bladesas viewed from the right side of the pen and illustrates the claspclosed and shows the ink-filling channel and transverse walls at upperend of ink magazine in dotted lines.

Like characters of reference indicate like parts throughout the severalviews of the drawing.

While I have shown my invention as applied to a pen for making straightlines, it is equally adapted to compass pens for drawing circles withoutthe exercise of invention and I will therefore describe it as a straightline pen.

Referring to the drawings, 10 is a handle of any usual and suitablematerial to which a shank carrying the blades of the pen is fastened,preferably by being screwed therein in the manner shown in the drawing.There are two blades 11 and 12, of which I designate the blade 11 as thetop and blade 12 the bottom one. The top blade.11 is pivotally securedby a screw 13 to a thickened inner end of blade 12, to permit the blade11 to be swung to one side for easy cleaning of the inner faces of theblades. The distance between the blades is regulated by a screw 14 inthe usual way. Both of the blades near their points are brought closertogether than is usual in such instruments to more fully prevent theescape of ink at that end when the pen, filled with ink, is closed.

The usual openings at each side of the pen between the two blades areclosed by angleplates 15 and 16, preferably of metal. One member of eachangle-plate is secured to the beveled edge of its respective blade byany suitable means, here shown as by rivets 17, but the plates may besecured by soldering, or they may be formed as integral exten sions ofthe blades. The other members of said angle-plates extend across thespace between the two blades and overlap the edge of the opposite blademaking a close sliding fit against it without being fastened to it.These plates extend preferably from near the point or drawing end of thepen to approximately midway between the screw 14: and the adjacent endof the handle 10, although this may be varied from. Slits 18 are formedin the plates 15 and 16 to permit the blades of the pen to adjust theirshapes when moved toward or from each other by the set-screw 14 inopening and closing the pen. These slits will preferably extenddiagonally of the sides of the plates to cause the edges of the slits tooverlap. The space thusv inclosed on four sides by the blades of the penand the attached angleplates comprises a chamber to receive a supply ofink for the pen, the inner end of which chamber or end next to thehandle will be closed by a pair of flanges 20, one for each blade,secured to the inner. face of the blade and projecting inwardly and thetwo flanges overlapping.

An opening 21 is formed through plate 15 through which ink will beintroduced into the above described reservoir, and when not open forfilling, this hole Will be closed by a clasp-plate 24 having a member atan angle therewith which is hinged at 25 to blade 12. The clasp is ofspring metal and has a looking detent 26 which springs into indent 27when the clasp is closed, to hold it in that position. A finger-hold 28on the clasp enables it to be drawn out and unlocked. To facilitate theintroduction of the ink which may be by means of an instrument similarto the well known medicine dropper, the wall of blade 12 will bechanneled as shown at 30, to admit the nozzle of the dropper. The innerface of the lower blade has a groove 31 to insure a better flow of inkto the point of the pen.

A pen as above constructed may be filled with ink in suflicient quantityto enable the operator to perform many more times the amount of workwithout refilling, than he could otherwise do, and the ink is protectedagainst evaporation and outside dust and dirt. The accumulation of anyforeign substance at the point may be easily removed by opening the penslightly and passing a pin or tooth pick between the points of theblades and by screwing the set-screw out the tending longitudinally ofthe blades between which the blades are located one longitudinal edge ofa plate being attached to one of the blades said plate extending thenceacross the opening between the blades and contacting with the otherblade, the two plates being attached to diiferent blades.

2. In a drawing instrument, a pair of blades, means for adjusting thedistance between the blades, a pair of plates extending longitudinallyof the blades between which the blades are located one longitudinal edgeof a plate being attached'to one of the blades said plate extendingthence across the opening between the blades and contacting with theother blade, the two plates being at- .tached to difierent blades, andmeans at the upper ends of the plates for closing the space bounded bysaid blades and plates.

3. In a drawing instrument, a pair of blades, means for adjusting thedistance between the blades, a pair of plates extending longitudinallyof the blades between which the blades are located one longitudinal edgeof a plate being attached to one of the blades said plate extendingthence across the opening between the blades and contacting with theother blade, the two plates being attached to diiferent blades, andpartitions at the upper ends of the plates carried by said blades forclosing the space bounded by said blades and plates.

4. In a drawing instrument, a pair of blades, means for adjusting thedistance between the blades, a pair of plates extending longitudinallyof the blades between which the blades are located one longitudinal edgeof a plate being attached to one. of the blades said plate extendingthence across the opening between the blades and contacting with theother blade, the two plates being attached to different blades,partitions at the upper ends of the plates carried by said blades forclosing the space bounded by said blades and plates, and one of saidplates having an opening through which the pen is supplied with ink andmeans for.

closing the opening.

5. In a drawing instrument, a pair of blades, adapted to contact witheach other at their points and back an appreciable'distance therefromand having a channel in a contacting face of a blade to aid the flow ofink to the point, a pair of plates extending longitudinally of theblades between which the blades are located one longitudinal edge of aplate being attached to one of the blades said plate extending thenceacross the opening between the blades to and against an edge of theother blade.

6. In a drawing instrument, ,a pair of blades, adapted to contact witheach other at their points and back an appreciable distance therefromand having a channel in a' contacting face of a blade to aid the flow ofink to the point, a pair of plates extending longitudinally of theblades between which the blades are located one longitudinal edge of aplate being attached to one of the blades said plate extending thenceacross the opening between the. blades to and against an edge of theother blade, said plates having transverse slits to afford freedom ofadjustment of the blades to which;

they are attached.

.7. In a drawing instrument, a pair of blades, adapted to contact witheach other at their points and back an appreciable distance therefromand having a channel in a contacting face of a blade to aid the fiow ofink to the point, a pair of plates extending longitudinally of theblades between which the blades are located one longitudinal edge of aplate being attached to one of.

the blades said plate extending thence across the opening between theblades to and against an edge of the other blade, said plates havingtransverse slits to aiford freedom of adjustment of the blades to which.they are attached, each of said blades having inwardly extendingflanges which pass each other and form a partition.

8. In a drawing instrument, a pair of blades, adapted to contact witheach other at their points, and back an appreciable distance therefromand having a channel in a contacting face of a blade to aid the flow ofink to the point, a pair of plates extending longitudinally of theblades between which the blades are located one longitudinal edge of aplate being attached to one of the blades said plate extending thenceacross the opening between the blades to and against an edge of theother blade, said plates having transverse slits to afford freedom ofadjustment of the blades to which they are attached, each of said bladeshaving inwardly extending flanges which pass In Witness whereof, I, havehereunto set 20 my hand and seal at Indianapolis, Indiana, this 24th dayof June, A. D. one thousand nine hundred and eleven.

JOHN CHARLES FERGER.

\Vitnesses:

JOSEPH A. MINTURN, F. W. WOERNER.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, I

Washington, I). G.

